diff --git a/references.bib b/references.bib
index fabb91c..7da5659 100644
--- a/references.bib
+++ b/references.bib
@@ -492,7 +492,7 @@
 	booktitle = {Ethics in Networked Systems Research},
 	publisher = {ACM},
 	year = {2015},
-	url = {http://ensr.oii.ox.ac.uk/wp-content/uploads/2015/07/Forgive-Us-Our-SYNs-Technical-and-Ethical-Considerations-for-Measuring-Internet-Censorship.pdf}
+	url = {http://ensr.oii.ox.ac.uk/wp-content/uploads/2015/07/Forgive-Us-Our-SYNs-Technical-and-Ethical-Considerations-for-Measuring-Internet-Censorship.pdf},
 }
 
 @inproceedings{Smits2011a,
@@ -865,7 +865,7 @@
 	title = {An anomaly-based censorship-detection system for {Tor}},
 	institution = {The Tor Project},
 	year = {2011},
-	url = {https://research.torproject.org/techreports/detector-2011-09-09.pdf}
+	url = {https://research.torproject.org/techreports/detector-2011-09-09.pdf},
 }
 
 @inproceedings{Detal2013a,